J Adv Prosthodont.  2021 Feb;13(1):24-35. 10.4047/jap.2021.13.1.24.

Effect of rinsing time on the accuracy of interim crowns fabricated by digital light processing: An in vitro study

Affiliations
  • 1Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea
  • 2Medical Device Research Division, National Institute of Food and Drug Safety Evaluation, Osong, Republic of Korea

Abstract

PURPOSE
This study was to evaluate the effect of rinsing time on the accuracy of interim crowns fabricated by digital light processing.
MATERIALS AND METHODS
The maxillary right first molar master die was duplicated using a silicone material, while a study die was produced using epoxy resin. Scans of the epoxy resin die were used in combination with CAD software to design a maxillary right first molar interim crown. Based on this design, 24 interim crowns were fabricated with digital light processing. This study examined the trueness and precision of products that were processed with one of the three different postprocessing rinsing times (1 min, 5 min, and 10 min). Trueness was measured by superimposing reference data with scanned data from external, intaglio, and marginal surfaces. Precision was measured by superimposing the scan data within the group. The trueness and precision data were analyzed using KruskalWallis, nonparametric, and post-hoc tests, and were compared using a MannWhitney U test with Bonferroni correction (α=.05).
RESULTS
The trueness of the external and intaglio surfaces of crowns varied significantly among the different rinsing times (P=.004, P=.003), but there was no statistically significant difference in terms of trueness measurements of the marginal surfaces (P=.605). In terms of precision, statistically significant differences were found among the external, intaglio, and marginal surfaces (P=.001).
CONCLUSION
Interim crowns rinsed for 10 minutes showed high accuracy.

Keyword

Additive manufacturing; Digital light processing; Rinsing time; Interim crown; Accuracy
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